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Experimental Study of the Salt Transfer in a Cold Sodium Sulfate Soil

  • Xusheng WanEmail author
  • Fumao Gong
  • Mengfei Qu
  • Enxi Qiu
  • Changmao Zhong
Geotechnical Engineering
  • 17 Downloads

Abstract

Salt migration and accumulation are the main sources of salt expansion. To study the role of salt transport in soil, laboratory tests were conducted to simulate salt transfer under real conditions. Temperature, water content, salt content and soil displacement of a sodium sulfate soil were measured during the freezing process/freeze-thaw cycles. Meanwhile, Salt concentration was regressed bases on test data to investigate the movement of salt diffusion, in the process, the Pitzer ion model was employed to calculate the freezing point of saline soils to determine the frozen depth. Moreover, the amount of crystallization was estimated by the saturation curve of a sodium sulfate solution and the detected salt content. The results show that salt transfer in soil occurs as a result of numerous physicochemical processes and that the maximum salt transport occurred in the frozen fringe zone in the soil. Salt crystallization increases the effect of salt transfer in the soil unidirectional freezing process. In addition, salt expansion had an accumulative effect, and it increases as the number of freeze-thaw cycles increases. The quantity of salt that is transported increases as the salt content increases.

Keywords

sodium sulfate soil salt transfer conductivity salt expansion salt crystallization 

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Copyright information

© Korean Society of Civil Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Xusheng Wan
    • 1
    Email author
  • Fumao Gong
    • 1
  • Mengfei Qu
    • 1
  • Enxi Qiu
    • 1
  • Changmao Zhong
    • 1
  1. 1.School of Civil Engineering and ArchitectureSouthwest Petroleum UniversityChengduChina

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